JP4231866B2 - Tap selector - Google Patents

Description

  The present invention relates to a tap selector of an on-load tap changer that is a component of a transformer or a voltage regulator.

The following is known as a conventional roller contact device for a tap selector. A pair of upper and lower rollers are held on the body, the ring-shaped current collecting contact and the fixed contact arranged on the outside are sandwiched by a set of rollers, and the contact point for the current collecting contact of each roller is the contact part for the fixed contact In the roller contact device for a tap selector, which is formed with a smaller diameter compared to the center of the current collector contact and is provided with a set of rollers that can rotate with the center of the current collector contact as the center point, the body is attached to the insulated rotating shaft provided inside the current collector contact. The upper part of the body that has a vertically symmetrical structure is opened with a receiving hole, and the base part of the roller shaft is accommodated in the receiving hole in a state where there is play up and down, and the front part of the roller shaft faces the fixed contact. A cylindrical roller is supported on the tip of the roller shaft rotatably via a bearing, and a pressurizing tool that applies contact pressure to the roller from above is fixed to an intermediate portion of the roller shaft. The cross-sectional shape of the tip part A fitting groove is formed on the upper surface of the pressurizing tool, and is formed in a concave groove shape along the surface. The fitting groove has a pressing point of the roller directly above the intermediate point between the contact portion for the current collecting contact and the contact portion for the fixed contact. The base of the leaf spring that presses the pressure tool is fixed to the upper surface of the body, and the tip of the leaf spring is fitted in the fitting groove of the pressure tool while keeping the tip of the leaf spring above the pressure tool. The distance between the plate springs is the vertical width of the roller contact device (Patent Document 1).
JP 2003-309022 A (Claims)

  As shown in FIG. 10 (A), the conventional product described above sandwiches both the current collecting contact 91 and the fixed contact 92 in the tap steady state (the current collecting contact and the fixed contact are energized). The upper and lower roller shafts 93 and 93 are parallel to each other. However, as shown in FIG. 10B, only the current collecting contacts are sandwiched during the tap switching. Then, since the base portion of the roller shaft is accommodated in the accommodation hole 94 with play, the roller shaft is slightly rotated around the contact point P with the current collecting contact by the force of the leaf spring 95 to close the accommodation hole. The base end point Q of the roller shaft comes into contact with the seat 96.

  Therefore, when the insulating rotating shaft 97 is rotated for tap switching, the roller is advanced by the action of narrowing the interval between the upper and lower rollers 98 immediately before the roller is separated from the fixed contact. Therefore, a stress amplitude is given to the insulating rotating shaft side (drive system), which is undesirable in terms of repeated fatigue strength. In addition, as shown in FIG. 11, the fixed contact 92 is usually provided with slopes 99 that gradually become thinner toward both ends on both the left and right sides in the circumferential width direction so as to be easily switched. It is the cause.

  On the other hand, as shown in FIG. 11, just before the end of the tap switching (when climbing on the fixed contact), the roller climbs on the fixed contact by overcoming the clamping force of the upper and lower leaf springs. A force Fa in the direction opposite to the direction of turning is applied from the contact point A1 of the fixed contact. Due to the reverse force Fa, the pressing forces Fb and Fc act on the contact point B1 on the entrance side of the receiving hole and the contact point C1 on the back side of the hole, respectively. Since the upper and lower roller shafts are inclined in the direction in which the tips approach each other, a large frictional force is generated at the contact points B1 and C1 to which the pressing forces Fb and Fc are applied in order for the upper and lower roller shafts to be parallel. Increase the reverse force. For this reason, it is necessary to apply a large rotational force to the insulating shaft, and the durability of various parts to which the force is applied, and thus the reliability of the product, is reduced. Examples of the various parts include an insulating shaft, a roller shaft, a bearing built in the roller, and a body that opens a receiving hole. Therefore, in order to increase the reliability of the product, the strength of various parts must be increased, leading to an increase in cost and there is a limit to improving the strength.

  The present invention has been made in consideration of the above circumstances, and its purpose is to minimize the force applied to the roller from the fixed contact when leaving the fixed contact and when switching to another fixed contact at the time of tap switching. It is an object of the present invention to provide a highly reliable tap selector that eliminates this problem and does not adversely affect the rotational force of the insulating shaft. Another purpose is to keep costs as low as possible.

  The invention according to claim 1 has an insulating rotating shaft in the center of the ring-shaped current collecting contact, and has a plurality of fixed contacts arranged at intervals in the circumferential direction in the vicinity of the outer side of the current collecting contact, A roller contact device is fixed to the body, and the roller contact device holds a pair of upper and lower rollers on a body fixed to an insulated rotating shaft, and the current collecting contact and the selected fixed contact are held in parallel by a set of rollers. Each roller is provided with a contact point for current collecting contact and a contact point for fixed contact, and a set of rollers is provided so as to be rotatable with respect to the center of the current collecting contact. Opens the receiving hole and stores the base part of the roller shaft with play in the up and down direction, and extends the tip part of the roller shaft toward the fixed contact so that the cylindrical roller is attached to the roller shaft. Support the tip part rotatably via a bearing, The pressure tool that applies contact pressure to the roller from above is fixed to the middle part of the roller shaft, and the upper range from the current collector contact part toward the fixed contact part is covered with the tip part of the pressure tool, A fitting groove is formed on the upper surface of the pressurizing tool, and a base portion of the leaf spring that presses the pressurizing tool is formed on the upper surface of the pressurizing tool, with the pressing point of the roller being directly above the middle point between the contact part for the current collecting contact and the contact part for the fixed contact. Fixing to the upper surface of the body, with the tip of the leaf spring extending above the pressurizing tool, the tip of the leaf spring is fitted into the fitting groove of the pressurizing tool, and the distance between the upper and lower leaf springs is determined by the roller contact device. Assuming a tap selector that has a vertical width of.

  Then, the support contact main body of the tap switching support contact is arranged from the outside of the current collecting contact toward the vicinity in the circumferential direction where the fixed contact is disposed, and the left and right sides of the fixed contact in the circumferential width direction are spaced apart in the circumferential direction. The roller contact device is provided with a switching support contact contact portion between the fixed contact contact portion and the current collecting contact contact portion. In order to maintain the parallel clamping state of the upper and lower rollers during tap switching, the fixed contact thickness is uniformly formed in the circumferential direction, and the thickness of the fixed contact <support contact body <current collector contact size relationship And the diameter is formed so as to be in a size relationship of fixed contact contact portion> switching support contact contact portion> collecting contact contact portion.

  With the above configuration, when the roller contact device rotates and moves to the left or right side in the circumferential width direction of the fixed contact at the tap switching, the tap switching support contact at the upper and lower tap switching support contact portions of the roller And the current collecting contacts are sandwiched between the contact portions for the current collecting contacts above and below the roller. This clamping state will continue until it is moved away from the fixed contact and transferred to another fixed contact.

  The tap switching support contact may be a complete space between the support contact body parts adjacent to each other in the circumferential direction. However, a thin non-contact portion is provided between the support contact body parts to form a ring as a whole. It may be a shape. A ring shape can secure a sufficient amount of current to the current collecting contact. Further, the tap switching support contact may be a single component that is continuous with the current collecting contact, or may be a separate component from the current collecting contact, and may be secured to the outside of the current collecting contact with a screw or the like.

  In the first aspect of the present invention, the roller contact device is a device that holds a pair of upper and lower rollers on the body. Instead, as in the second aspect of the present invention, the pair of upper and lower rollers are spaced apart in the circumferential direction. You may use what opens two sets and hold | maintains two sets to a body. That is, the current collecting contact and the selected fixed contact are sandwiched in parallel by two sets of rollers, each roller is provided with a current collecting contact contact portion and a fixed contact contact portion, and two sets with the center of the current collecting contact as the center point. The roller is provided so that it can rotate together with the body, the body is fixed to an insulating rotating shaft provided inside the current collecting contact, and two receiving holes are provided in the circumferential direction on the upper side of the body that is vertically symmetrical, In each receiving hole, the base of the roller shaft is accommodated in a state where there is play up and down, and the tip of each roller shaft is extended toward the fixed contact, and the cylindrical roller is bearing on the tip of the roller shaft. A pressurizing tool that rotatably supports the roller and applies a contact pressure to the roller from above is fixed to the middle part of each roller shaft, and the upper range from the collector contact point to the middle of the fixed contact point Cover with the tip of the pressure tool, contact part for current collector contact and contact part for fixed contact A fitting groove is formed on the upper surface of each pressurizing tool with the roller pressing point directly above the middle point, and the base of the leaf spring that presses the pressurizing tool is fixed to the upper surface of the body. The tip of the leaf spring is fitted into the fitting grooves of the upper two pressure tools while the upper side of the pressure spring is aligned, and the distance between the upper and lower leaf springs is set as the vertical width of the roller contact device.

  Further, since the contact portion for the tap switching support contact is provided on the roller, if the upper portion of the upper tap switching support contact portion is completely covered with the tip portion of the pressure tool, the vertical direction of the pressure tool tip portion The height of the roller contact device is increased by the wall thickness. Therefore, in order to keep the height dimension compact, it is desirable to make it like the invention of claim 3. That is, the upper one of the pressurizing tools has a base portion as a roller shaft mounting portion, and a tip portion of the pressure spring that covers the upper range of the roller current collecting contact contact portion and the tap switching support contact contact portion. The latching portion for leaf spring, the latching portion for leaf spring, as the inner groove portion that opens downward in the back, and the contact portion for current collecting contact is accommodated in the inner groove portion with a gap on the upper and left and right sides, An opening that leads up and down is provided at the tip and in the center in the width direction. The tip covers only the left and right sides of the contact portion for the tap switching support contact, and the upper portion of the contact portion for the tap switching support contact is formed in the opening. The tip of the leaf spring is housed in a form that branches off by forming a cut-out portion that avoids interference with the contact portion for the tap switching support contact at the central portion of the width.

  By adopting the above-described configuration, the roller contact device is provided with a tap switching support contact from immediately before the roller contact device leaves the fixed contact during tap switching until the roller contact device leaves the fixed contact and transfers to another fixed contact. It will be sandwiched. Therefore, since the roller contact device always has a structure that sandwiches one of the tap switching support contact and the fixed contact and the current collecting contact, when the tap is switched, the roller contact device is fixed when leaving the fixed contact and when moving to another fixed contact. There is no force applied to the roller from the contact point, and there is no adverse effect on the rotational force of the insulated rotating shaft, and the tap selector is highly reliable. Since the rotational force of the insulated rotating shaft is not adversely affected, the strength of various parts can be made lower than before and costs can be reduced. In addition, since the fixed contact may be formed with a uniform thickness in the circumferential direction, it is not necessary to provide a gradient as in the prior art, and costs can be reduced.

  Moreover, the height dimension of a pressurizing tool can be suppressed by providing an opening part etc. about the front part of a pressurizing tool. Furthermore, the height of the leaf spring can be suppressed by the amount of the cut portion by branching the tip portion and providing the cut portion at the lateral width central portion. Therefore, the height dimension of the tap selector can be kept compact.

  As shown in FIG. 1, the tap selector is configured such that odd-numbered taps T1 and even-numbered taps T2 are arranged adjacent to each other on the left and right. Then, for each of the odd tap T1 and the even tap T2, the outside of the insulated rotating shaft 1 is surrounded by the current collecting contact 2, and the tap switching support contact 3 is continuously provided outside the current collecting contact 2, thereby providing the tap switching support. A plurality of plate-like fixed contacts 4 are arranged in the vicinity of the outside of the contacts 3 at intervals in the circumferential direction, and a roller contact device 5 protrudes outwardly and is fixed to the insulated rotating shaft 1. The current collecting contact 2 and the selected fixed contact 4 are sandwiched at the front part of the contact device 5, and the current collecting contact 2 and the tap switching support contact 3 are sandwiched at the front part of the roller contact device 5 during the tap switching. .

  As shown in FIG. 1, the current collecting contact 2 and the tap switching support contact 3 are formed as one part made of a P-shaped flat plate. A current collecting contact that functions as the current collecting contact 2 in the inner periphery of the ring-shaped portion of the P-shape, that is, the portion surrounding the insulating rotating shaft 1 circumferentially. The main body portion 6 serves as a tap switching support contact 3 for the outer peripheral portion of the circumferentially surrounding portion so that the roller contact device 5 can easily hold another fixed contact 4 at the time of tap switching. On the other hand, in the P-shaped flat plate, a portion other than the ring shape (a portion extending from the one end of the ring shape to the other and extending linearly) is set as the attachment portion 7, and a block-like shape is formed on the lower surface of the attachment portion 7. The insulating mounting plate 9 is applied via the spacer 8 and is bolted from the upper surface. As shown in FIG. 9, the insulating mounting plate 9 is connected to the frame shaft S of the entire on-load tap changer.

  As shown in FIG. 1, FIG. 2, or FIG. 3, the tap switching support contact 3 has a thin shape with its upper and lower surfaces recessed in a step shape from the current collecting contact body 6, and the circumference of each fixed contact 4 The portion corresponding to the inner peripheral side with respect to the central region R1 in the width direction is defined as a non-contact portion 10 with respect to the roller contact device 5, and the peripheral width direction right and left side range R2 of each fixed contact 4 and the range R3 between adjacent fixed contacts. A portion corresponding to the inner peripheral side of the support contact main body 11 as a contact portion with the roller contact device 5 is used. That is, a plurality of support contact main body portions 11 are arranged at intervals in the circumferential direction outside the current collecting contact 2. FIG. 2 shows only the current collecting contact main body 6 and the tap switching support contact 3, and the mounting portion 7 is removed from the current collecting contact 2.

  The non-contact portion 10 is formed to have substantially the same thickness as the fixed contact 4 in FIG. 3 (b), but is not limited to this thickness. The tap contact state (the roller contact device 5 is fixed to the current collecting contact main body 6). Any thickness that can ensure non-contact with the roller contact device 5 in a non-moving state in which the contact 4 is sandwiched is sufficient.

  The support contact main body 11 is formed thinner than the current collecting contact main body 6 as shown in FIG. 3 (a) and thicker than the fixed contact 4 as shown in FIG. 3 (b). The setting of the wall thickness takes into consideration that the support contact body 11 can be held in parallel during the tap switching while the roller contact device 5 maintains the parallel holding mode (interval) in the tap steady state.

  The fixed contact 4 is a flat plate as shown in FIG. 1 and has a uniform thickness along the circumferential direction centering on the insulated rotating shaft 1. Like the current collecting contact 2, a spacer 8 is provided on the lower surface thereof. Thus, the insulating mounting plate 9 is bolted.

  As shown in FIG. 1, the roller contact device 5 is a device in which a body 12 having a rotation area inside the current collecting contact 2 is fixed to an insulating rotating shaft 1, and various components are attached to the body 12 symmetrically. Hereinafter, only the upper part of the symmetrical part will be described. As shown in FIG. 3, FIG. 4, FIG. 5 or FIG. 6, the base of the roller shaft 13 is accommodated in the up and down state on the upper side of the body 12, and the tip of the roller shaft 13 is centered on the insulated rotating shaft 1. The portion protrudes radially above the fixed contact 4, and a cylindrical roller 14 is rotatably supported at the tip of the roller shaft 13 via a bearing 15. Further, a pressure tool 16 is fixed between each roller shaft 13 between the roller 14 and the body 12, the base portion of the leaf spring 17 is attached to the upper surface side of the body 12 with a bolt 18, and the tip portion of the leaf spring 17 is pressurized. The pressing force of the plate spring 17 is transmitted from the pressurizing tool 16 to the roller 14, and the roller shaft 13 integrated with the pressurizing tool 16 cannot be moved in the axial direction at the tip of the plate spring 17. to bound. An auxiliary plate spring 19 is stacked on the plate spring 17 to increase the pressing force to the pressurizing tool 16.

  The body 12 has a block shape as shown in FIG. 3 or FIG. 5 and is fixed from the side by a set screw 21 through the insulating rotary shaft 1 in a central hole 20 vertically penetrating. The body 12 has a housing hole 22 formed on the upper surface thereof for holding the base portion of the roller shaft 13 up and down with play. A plate-like spring seat 23 that covers the accommodation hole 22 is placed on the upper surface of the body 12, and a base portion of the leaf spring 17 is placed on the spring seat 23, and the spring seat 23, the leaf spring 17, and an auxiliary leaf spring. 19 is fastened to the body 12 with bolts 18. Although not shown, the body 12 and the spring seat 23 may be an integral block.

  In order to keep the upper and lower rollers 14, 14 in a constant state (the upper and lower roller shafts 13 are parallel), the diameter of each roller 14 is reduced in three steps toward the center of the insulated rotating shaft 1. The fixed contact contact portion 24> tap switching support contact contact portion 25> current collection contact contact portion 26 are formed in a size relationship. On the other hand, by correspondingly forming the thickness of the contact points 24 in the order of current collecting contact 2 (current collecting contact body 6)> tap switching support contact 3 (support contact main body 11)> fixed contact 4, each contact portion 24 is formed. , 25, 26 rotate without sliding on the surface of each contact 2, 3, 4. Further, the fixed contact contact portion 24 and the current collecting contact contact portion 26 are provided with Rs for contacting the respective contacts 2 and 4 at intermediate points in the entire length in the roller axial direction. Since the tap switching support contact portion 25 is not related to the amount of energization, there is no necessity to attach R. The roller has a cylindrical shape, and a portion corresponding to the inside of the contact portion for fixed contact 24 and the contact portion for current collecting contact 26 is formed in a stepped shape with a large diameter and accommodates the bearing 15. It should be noted that, as shown in FIG. 3 (a), the surplus portion Z between the tap switching support contact contact portion 25 and the current collection contact contact portion 26 is provided by an amount necessary for attaching an R of the current collection contact contact portion. Is intervening.

  The bearing 15 uses a needle roller bearing as shown in FIG. 6B and is accommodated between the roller shaft 13 and the roller 14. Further, in order to position the roller 14 at the tip of the roller shaft 13, the bearing 15 accommodated in the fixed contact contact portion 24 is provided with a thrust ring 27a having a small inner diameter on the end face side thereof. A retaining ring 27b disposed on the outer side of 27a is retained in the groove of the roller shaft 13. On the other hand, the bearing 15 accommodated in the current collecting contact portion 26 has a pressurizing tool 16 disposed on the end face side, and the pressurizing tool 16 is fixed to the roller shaft 13.

  As shown in FIG. 4 or FIG. 6, the base of the pressurizing tool 16 is a roller shaft mounting portion 28, and the leaf spring locking portion 29 is connected from the roller shaft mounting portion 28 to the current collecting contact of the roller 14. It extends from the upper part of the part 26 to a state in which it covers the left and right sides and covers only the left and right sides of the contact part 25 for tap switching support contacts.

  The roller shaft mounting portion 28 has an insertion hole 30 into which the base portion of the roller shaft 13 is inserted at the center of the lateral width of the surface near the body, and a screw hole 32 into which the captive screw 31 is horizontally screwed. A screw hole 32 is formed perpendicular to the insertion hole 30. The roller shaft 13 is also provided with a positioning hole 33 on the surface facing the screw hole 32, and the tip of the captive screw 31 is fitted into the positioning hole 33.

  The leaf spring locking portion 29 is formed with a fitting groove 34 for fitting the front end portion of the leaf spring 17 along the direction orthogonal to the roller shaft 13 on the top surface of the tip portion. The formation position of the fitting groove 34 is set based on the following idea. As shown in FIG. 7, the point of action of the tip of the leaf spring 17 (formation position of the fitting groove 34) is A, the contact point of the fixed contact contact portion 24 with respect to the fixed contact 4 is the external contact point B, and the current collecting contact Each contact point of the current collecting contact 26 is defined as an inner contact point C, and each contact point of the tap switching support contact 25 corresponding to the tap switching support contact 3 is defined as a central contact point D. By arranging the central contact point D just below the point of action A of the leaf spring 17 by making the distance between A and B and B and C the same in the horizontal direction, the leaf spring 17 in the tap steady state. The load W is equally divided and acts on the inner and outer contact points B and C by 1/2 W. On the other hand, during the tap switching, the load W of the leaf spring 17 acts on the center contact point D as it is. There is no. Therefore, the upper and lower rollers 14 and the roller shaft 13 remain parallel and do not tilt even in the tap steady state or during the tap switching. Note that, as described above, the tap switching support contact contact portion 25 is not an exact point of the center contact point D, and may be contacted in a planar shape, so that no R is given.

  Further, as shown in FIG. 3 or FIG. 6, the leaf spring locking portion 29 is formed as an inner groove portion 35 that opens downward at the back thereof, and a gap is formed above the current collection contact contact portion 26 on the left and right sides. In addition to being accommodated in the inner groove portion 35, an opening 36 is provided at the tip and at the center in the horizontal width direction, and the tip 36 covers only the left and right sides of the tap switching support contact portion 25. By accommodating the upper part of the tap switching support contact contact portion 25, the upper end of the leaf spring locking portion 29 is equal to or lower than the height of the upper end of the tap switching support contact contact portion 25, and the contact for the current collecting contact The height of the roller contact device 5 is kept compact by setting the thickness to be equal to or greater than the thickness necessary to cover the upper portion 26.

  As shown in FIG. 5, the plate spring 17 has a shape in which the base portion is horizontal to be attached to the spring seat 23 before being assembled, the tip portion is bent obliquely downward, and the tip portion is bent at a right angle toward the inside. After assembly, as shown in FIGS. 3 and 4, a portion of the base portion away from the spring seat 23 is curved upward to generate a restoring force, the tip portion becomes substantially horizontal, and the tip portion is It goes downward and fits into the fitting groove 34. An auxiliary leaf spring 19 for increasing the restoring force is overlaid on the leaf spring 17. The auxiliary leaf spring 19 has a configuration in which the tip of the leaf spring 17 that overlaps the lower side is removed. Since the height of the tip of the auxiliary leaf spring 19 after assembly is the same as or higher than that of the bolt 18 for fixing the spring seat, the vertical dimension of the roller contact device 5 as a whole is the upper and lower leaf springs 19. , 19 is the distance. If a sufficient restoring force is obtained for the leaf spring 17, the auxiliary leaf spring 19 is not necessary. Further, in order to make the vertical dimension of the roller contact device 5 compact, the front end portion of the leaf spring 17 (the portion that fits into the fitting groove 34) interferes with the tap switching assist contact portion 25 at the center of the lateral width. The cut portion 37 is formed so as to be bifurcated, and the cut portion 37 accommodates the upper end portion of the contact portion 25 for the tap switching support contact. Incidentally, the upper end portion of the roller shaft mounting portion 28 has a shape with a corner corresponding to the curved portion of the plate spring 17 after assembly.

  The tap selector described above uses the roller contact device 5 that uses a pair of upper and lower rollers 14 and 14, but is not limited to this, and another example tap selector is shown in FIG. Alternatively, a roller contact device 5 using a pair of upper and lower rollers 14 and 14 using a fixed contact 4 that is wide in the circumferential direction may be used.

  Since the roller contact device 5 has a vertically symmetrical structure, only the upper structure will be described. In the upper side of the body 12, two housing holes 22 are radially arranged around the insulating rotary shaft 1 (the housing holes in the figure). Shows only one). There are two roller shafts 13, pressurizing tools 16, and rollers 14, and they are attached in the same manner as in the previous example. On the other hand, the spring seat 23 is a single piece and closes the two accommodation holes 22 at a time. Further, a fitting groove 34 is formed in a straight line on the upper surface of the front part of the two pressurizing tools 16 arranged in parallel, and the end portions of the leaf springs 17 are fitted into the two fitting grooves 34, so that both rollers 14, 14 are formed. Press down at once.

  The fitting grooves 34 of the upper two pressurizing tools 16 are formed directly above a straight line connecting the contact points of the tap switching support contact portions 25 of the rollers 14.

It is a perspective view which shows the tap selector of the odd-numbered side and the even-numbered side. It is a perspective view which shows the relationship between a current collection contact main-body part and a tap switching assistance contact. (A), (b), and (c) are a side view showing a state during tap switching, a side view showing a tap steady state, and a cross-sectional view taken along line EE. It is an assembly drawing of a roller contact device. It is an exploded view of a roller contact device. (A) and (B) are an assembly drawing and an exploded view showing the relationship between the roller, the roller shaft, the pressurizing tool, and the like. It is a side view explaining the relationship of a spring load. It is a top view which shows another example of a tap selector. It is drawing which shows the whole image of the tap switch at the time of load. 6 is a diagram illustrating problems of a conventional tap selector. It is a drawing which points out another problem of the conventional tap selector.

Explanation of symbols

  1: Insulating rotary shaft, 2: Current collecting contact, 3: Tap switching support contact, 4: Fixed contact, 5: Roller contact device, 6: Current collecting contact body, 7: Mounting portion, 8: Spacer, 9: Insulation Mounting plate, 10: non-contact portion, 11: support contact body, 12: body, 13: roller shaft, 14: roller, 15: bearing, 16: pressurizing tool, 17: leaf spring, 18: bolt, 19: Leaf spring, 20: extraction hole, 21: set screw, 22: receiving hole, 23: spring seat, 24: contact portion for fixed contact, 25: contact portion for tap switching support contact, 26: contact portion for current collecting contact, 27a: thrust ring, 27b: retaining ring, 28: roller shaft mounting portion, 29: leaf spring locking portion, 30: insertion hole, 31: captive screw, 32: screw hole, 33: positioning hole, 34: Fitting groove, 35: inner groove part, 36: opening part, 37: excised part, S: frame Shaft, T1: odd, T2: even-numbered, R1: central range, R2: left and right portions ranges, R3: range between the fixed contacts

Claims (3)

A plurality of fixed contacts (4) having an insulating rotating shaft (1) at the center of the ring-shaped current collecting contact (2) and arranged at intervals in the circumferential direction are located near the outside of the current collecting contact (2). A roller contact device (5) is fixed to the insulated rotating shaft (1),
The roller contact device (5) holds a pair of upper and lower rollers (14, 14) on a body (12) fixed to an insulated rotating shaft (1), and selects a current collecting contact (2) and a fixed contact (4) selected. ) Are held in parallel by a pair of rollers (14, 14), and each roller (14) is provided with a collector contact point contact portion (26) and a fixed contact point contact portion (24). A pair of rollers (14, 14) is provided so as to be rotatable together with the body (12) with the center of the center as a center point, and an accommodation hole (22) is formed on the upper side of the body (12) having a vertically symmetrical structure. The base of the roller shaft (13) is accommodated in a state where there is play up and down, the tip of the roller shaft is extended toward the fixed contact (4), and the cylindrical roller (14) is moved to the roller shaft ( 13) is rotatably supported through a bearing (15) at the tip of the roller and is in contact with the roller (14). A pressurizing tool (16) for applying pressure from above is fixed to an intermediate portion of the roller shaft (13), and an upper range from the current collecting contact contact portion (26) to the middle of the fixed contact contact portion (24). The fitting groove (34) is covered with the tip of the pressure tool (16) and has a roller pressing point directly above the intermediate point between the current collecting contact point (26) and the stationary contact point (24). The base of the leaf spring (17) that is formed on the upper surface of the pressurizing tool (16) and presses the pressurizing tool is fixed to the upper surface of the body (12), and the tip of the leaf spring (17) is fixed to the pressurizing tool ( 16), the tip of the leaf spring (17) is fitted into the fitting groove (34) of the pressurizing tool, and the distance between the upper and lower leaf springs (17, 17) is set to the vertical width of the roller contact device. In the tap selector that is
The support contact main body (11) of the tap switching support contact (3) is spaced from the outer side of the current collecting contact (2) in the circumferential direction toward the vicinity of the circumference in which the fixed contact (4) is disposed. The fixed contacts (4) project radially from the left and right side range (R2) in the circumferential width direction and the range (R3) between the adjacent fixed contacts,
The roller (14) of the roller contact device (5) is a contact for tap switching support contact that rolls the support contact body (11) between the contact portion for fixed contact (24) and the contact portion for current collecting contact (26). Part (25),
In order to maintain the parallel clamping state of the upper and lower rollers (14) during the tap switching, the thickness of the fixed contact (4) is uniformly formed in the circumferential direction, and the thickness is fixed contact (4) <support contact The size of the main body (11) <the current collecting contact (2) and the diameter of the contact portion (24) for the fixed contact> the contact portion for the tap switching support contact (25)> the contact portion for the current collecting contact (26 A tap selector characterized by being formed in a magnitude relationship of 2. The tap selector according to claim 1, wherein the roller contact device (5) has a pair of upper and lower rollers spaced apart in the circumferential direction instead of a pair of upper and lower rollers held on the body (12). Using two sets held on the body (12),
The current collecting contact (2) and the selected fixed contact (4) are held in parallel by two sets of rollers (14, 14), and each roller (14) is contacted with a current collecting contact (26) and a fixed contact. A portion (24) is provided, and two sets of rollers (14, 14) are provided so as to be rotatable together with the body (12) around the center of the current collecting contact (2), and are provided inside the current collecting contact (2). The body (12) is fixed to the insulated rotating shaft (1), and two receiving holes (22) are provided on the upper side of the body (12) having a vertically symmetrical structure so as to be separated from each other in the circumferential direction. The base of (13) is accommodated in a state where there is play up and down, and the tip of each roller shaft is extended toward the fixed contact (4), so that the cylindrical roller (14) is a roller shaft (13 ) Is supported rotatably via a bearing (15) at the front end of the roller), and contact pressure is applied to the roller (14) from above. The pressure tool (16) is fixed to the intermediate portion of each roller shaft (13), and the upper range from the current collector contact portion (26) to the middle of the fixed contact point is the tip of the pressure tool (16). Each pressurizing tool (16) with a fitting groove (34) having a roller pressing point directly above the intermediate point between the current collecting contact point contact portion (26) and the stationary contact point contact portion (24). The base of the leaf spring (17) that presses the pressure tool is fixed to the upper surface of the body (12), and the tip of the leaf spring (17) is placed above the pressure tool (16). On the other hand, the tip of the leaf spring (17) is fitted into the fitting grooves (34) of the upper two pressurizing tools, and the distance between the upper and lower leaf springs (17, 17) is set to the vertical width of the roller contact device. Features a tap selector. The upper one of the pressurizing tools (16) has a base portion as a roller shaft mounting portion (28), and a tip portion as a current collecting contact contact portion (26) of the roller (14) and a tap switching support contact. A leaf spring locking portion (29) covering the upper range of the contact portion (25),
The leaf spring locking portion (29) has an inner groove portion (35) that opens downward in the inner portion thereof, and the current collecting contact contact portion (26) is spaced upward and left and right to form an inner groove portion (35). ) And an opening (36) leading up and down at the center in the widthwise direction is provided, and the tip covers only the left and right sides of the tap switching support contact contact portion (25). The upper part of the contact part (25) for tap switching assistance contacts is accommodated in the part (36),
The distal end of the leaf spring (17) is characterized in that it is branched by forming a cutout portion (37) that avoids interference with the contact portion (25) for tap switching support contact at the center of the lateral width. The tap selector according to claim 1 or 2.

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